Compact microstrip lowpass filter with sharp roll-off and wide stop-band |
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Authors: | Li J.-L. Qu S.-W. Xue Q. |
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Affiliation: | City University of Hong Kong, Hong Kong, SAR, People's Republic of China; |
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Abstract: | A microstrip lowpass filter with enhanced performance is developed. The studied filter is based on a novel patch resonator that features strong slow-wave effects, and can also implement either an improved roll-off or an enhanced stop-band. A demonstrator filter with 3 dB cutoff frequency fc ? 2.4 GHz is optimally designed, fabricated and measured. Results indicate that a roll-off of 92.5 dB/GHz together with a relative stop-band bandwidth of 135.5% (referred to a 30 dB suppression) is obtained while achieving a highest figure-of-merit of 10106. Both simulations and measurements are presented and compared. |
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